L64724 LSI Logic Corporation, L64724 Datasheet - Page 234

• Manufacturer Part Number: L64724
• Description: Satellite Receiver
• Manufacturer: LSI Logic Corporation

B-20
Equation B.27
The damping factor (
values we get L
We can now calculate
B.29.
Equation B.28
Equation B.29
CLK_MU_SEL[3:0] and CLK_LAMBDA_SEL[3:0] are defined in
B.31
Equation B.30
Equation B.31
Program the four LSBs of APR 42 with 0xA and the four MSBs of
APR 42 with 0xA.
Group 4, APR 43–44 – Set to 0x0FA0.
The value for the clock sweep rate, CLK_SWR[15:0], is set according to
Equation
L64724 Application Notes
CAR_MU_SEL
CAR_LAMBDA_SEL
b
a
b
=
Note:
and
=
=
---------------------- -
K
2
---------------------------------------------------------------------- -
2 10.6 10
---------------------------------------------------------------------- -
tim
10.6 10
B.32, assuming a clock sweep rate of 1 MHz/s.
Equation
L
n
tim
T
Group 4, APR 43–48, contain sweep parameters that need
to be programmed only if clock sweep is required. These
parameters have meaning only when the CLK_SW bit (bit
D0 of Group 4, APR 53) is set to a 1.
0.0388 2.34
0.0388 2.34
tim
=
2
3 2
l og
= Fs x decimation_ratio/Fb = 50e6 x 1/21.3e6 = 2.34.
3
B.32.
-------------------------- -
21.3 10
2
=
-------------------------- -
21.3 10
is chosen as 1.0, and K
a
l og
1
and
a
1
2
2
6
28
b
b
6
2
as shown in
=
=
=
2
l og
16
3 10
11 10
2
=
3 e -6 2
l og
–
6
–
3
2
Equation B.28
11 e -3 2
tim
28
= 0.0388. Using these
=
10
16
=
0xA
=
and
10
=
Equation
Equation
0xA